Russian Imperial Issues. 1871 (April 30), 10k brown & blue (Sc. #23), used on entire wrapper from Szydlowiec to Warsaw, tied by ''1097'' in dotted truncated triangle, Szydlowiec 30. April. 1871 two- line ds, red next day arrival marking on reverse, mostly VF and scarce usage, Est. $200-$250 (Image)